Ok, if you're not doing training, you don't really need to be fitted. As for where to get one, we picked ours up at a lingerie/sex store for around $150, I think.
Speaking from a purely male point of view, I like the busk...the little line of flesh is great. It really depends on how you think it looks, and how much constriction you want(if you want constriction tight enough to cause anything more than a small amount of pain, if any, a busk isn't for you.) Another point in favor of the busk is that there will be times when all is said and done that you're ready to be out of your corset asap.
btw I know this site has several corsets on it I think, and the sysop is very helpful with any questions you might have, service is great too:
http://www.sub-shop.com/catalog/frameset.cfm